Re: [Xen-devel] [PATCH] Add device_model_pvdevice parameter for HVM guests

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Paul Durrant writes ("RE: [PATCH] Add device_model_pvdevice parameter for HVM 
guests"):
> > -----Original Message-----
> > From: Paul Durrant [mailto:paul.durrant@xxxxxxxxxx]
> > Sent: 04 July 2013 11:50
> > To: xen-devel@xxxxxxxxxxxxx
> > Cc: Paul Durrant; Stefano Stabellini
> > Subject: [PATCH] Add device_model_pvdevice parameter for HVM guests
> > 
> > The parameter determines which, if any, xen-pvdevice is specified on the
> > QEMU command line. The default value is 'none' which means no argument
> > will
> > be passed. A value of 'xenserver' specifies a xen-pvdevice with device-id
> > 0xc000 (the initial value in the xenserver namespace - see
> > docs/misc/pci-device-reservations.txt).
> > 
> > Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> > Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
> > ---
> 
> Re-ping? Stefano tells me he's waiting for an ack from either IanC or IanJ on 
> this one before dealing with the QEMU end of things. It's aleady been acked 
> by Matt Wilson.

Thanks for CCing this to me.  I don't seem to have any earlier
versions in my mailbox.

When you say the "xen-pvdevice", you mean what has traditionally been
called the "Xen platform PCI device" ?  Ie, the special PCI device
that HVM guests are provided with to enable them to make hypercalls
etc.

I see that 0xc000 has been reserved for use by Citrix XenServer.  But
that's simply a reservation.  If we're actually going to use this
value in our tree, we need some proper documentation of it.

I'm obviously missing some of the background.

Ian.

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